New Delhi, July 6 -- Since the Prime Minister mentioned a target of a $5 trillion economy by 2024, that number has been tossed around. $5 trillion has a nice, round aspirational ring to it. Obviously, $5 trillion isn't meant to be in purchasing power parity (PPP) terms. With PPP, India's GDP is already more than double the $5 trillion-mark. One means nominal GDP based on official exchange rates....